Mode of changing reciprocating into rotary motion



y sTATEs PATENT oEEioE. i

J. v. sTRAiT, or LiTcHEiELnoHio.

f ivroDE or CHANGING REGIPEOCATING INT0j EoTAEY MOTION.

.` 3i spciaeation ofiiettersratent No. 8,233, dated .Iuiy` 22,(1851.`

To allaqhomc't may concern.'

`Be itknown `that I, J. V. STEAIT, `of Litcheld, in the` county of Medina and StateofOhio, havefinvented anew anduse-` ful Method i or., Manner` of i Converting i a Reciprocating RectilinearMotion into a Ro-` taryiMovement, or Vice Versa, as Required;

and Ido `herebytdeclare that the `following isfull, clear, and ieXact description. of the same, reference being `had to the accompan ingdrawings, formingpart of this speci cation, in whichf-fl y i a Figure 1, fist-a `front elevation. Fig. 2` is aplan. i Fig.i3,isfa detached partial `front elevation,`a1nd=F igft, is `a 4detached partial back i View; ofthe portion represented in Similar letters of reference in the several figures referto correspondingparts.` i

The nature ofl my `invention refers` to the production" off` the i effects l expressed in the above. ytitle` and which are accomplished l by a combination, of i mechanical y `devices or parts that may serve as a substitute for the crank, `and consists in the employment of y parts formed with curvedor inclined `sur faces which, having a `reciprocatingrectilinear motion, act against, ,orare operated on by cams situated on the face of a disk, or its equivalent, which being made movable, admits of the motions thus produced, be-

ing made in reverse directions; and by which conversion of mechanical movements as specified, the rotary motio'n is maintained without the occurrence of the usual i dead` centers for points peculiar to the crank.

To enable others skilled in the art ltomake and use my invention I Will proceed to describe its construction and operation.

A, is a rod which mayrepresent the piston rod of a steam engine that, being attached to, serves to operate a cross head or frame B, which having a reciprocating rectilinear motion, travels against and` between slides or guides C, C, secured to a suitable stationary framing. -On the inner face of the cross head B,'-are firmly secured curved or inclined double arms or forks` D1, D2,`

and between, and near to them, similar but shorter forks E1 E?. These forks are made on suitable bearings, may be extended and made to form the driving shaft. i

1m29, c, are cams projecting from the front face of theidisk F, the pointsiofthemubeiiig set outward; they are attached tothe disk i atftheirbroader and inner` ends by spindles extending `at right, angles` from them through the disk,- so that` they may be" slightlyturned by means of levers d, d, d, which rare `attached through slotsinthem by pins iittedl in snugs e, i e, e, toma ring H,` provided with teeth or projecting` points I, is a handle `or lever of T form secured by joint to the` framing andwhose `bent arms serve to `press against the points j, f, and so by movngthe ring H, to operate the cams @,b, c. i f 1` i The operation and further description is -as follows: Motion being- Vgiven to the fram i ing Bbin thedirection indicated `by arrow s,

and the cams a, b, c, so set and` positioned i as that at the outer extremity of the stroke 5 of thewframe B, the outer end of `thecam a,

will lap,`on the upper limb` of the fork, i close toits `outside `or angular point,as `seen in Fig. l, but as seen more clearly inlblue, Fig. 3, then a circular movement` willlbe given to the disk F, as indicated by red arrow, through the travel (together with the frame` B) of the fork D', in the direction of the arrow, s which motion will be continued by the action of the fork D1, on the cam a until the forks and cams arrive at or a little beyond `the positions of them, shown in red lines Fig. 1, when the cam b,

`having entered between the forks D2, and

E2, is acted upon, for the completion of the stro-ke in direction of the arrow s, by the as to travel in direction of the arrow w", the

lower limb of the fork D2, will take up or `interior edge ofthe upper limb of the fork E2, which will operate the di'skF, (infthe course ofthe red arrow) until thecam b, ar

causev to be continued the motion (in the i course of the red arrow) of the disk by actingupon the cam b in a similar 'manner to the action of the fork D1, on the cam a until the cam @,by the forkEl, as was the case by the fork E2, `on the cam b, the several cams a, b, c, being thus acted upon alternately and causing three double strokes of the frame B, necessary to performone revolution of the diskF. y

When the motion of the disk F, is required to be 'reversed so as to travel in direction of the blue arrow, the lever I, is worked to one side as shown by its position in red lines Fig. l, causing, by continuing the pressure, through the bite of its bent arm on one of the teeth or points f, f, f, the ring I-I, to be slightly turned and with it the levers cl, cl, d, to be moved in the manner indicated by red outline Fig. 4, which will cause the cams a, Z2, c, to be also slightly turned to the positions as represented in dotted outlines of them Fig. l, but as more clearly seen in Fig. 3 by the representation (colored dark) of the cam a, in o-ne of and its lower position, when, by the movement of the frame B, in direction of the arrow s, (at the commencement of its stroke,) the ,cam a, will be acted upon by the lower instead of the upper limb of the fork D1, giving mot-ion in an opposite direction, vl. e., in the course of the blue arrow, to the disk F, through ythe altered position of the several cams which will cause the lower limbs of the forks D1 E2, and upper limbs of the forks D2, El, to operate upon them instead of the upper limbs of D1 E2, and lower limbs of D2 El, as was the case in producing/the motion of the disk F, in direction of the red arrow. When required to reverse again to the motion first described the lever I, is worked to the opposite side to that shown by its position in red lines, so that the ring H, may be worked back and the cams a, b, c, made to recover their desired or original position.

The operation thus far described is eX- planatory only of the converting of 'a reciprocating rectilinear motion into a rotary one, but it is evident that to produce a vice versa action, this is done, without any alteration of parts, by simply making the disk F, the driver instead of the rod-A; the same arrangements for reversing the motion being equally applicable; or for the purpose o-f'reversing, any other suitable arrangement for operating the movable cams may be used, as thought desirable, and any number of cams and forks employed, according to the required relative velocities of the two motions, that is, number of rot-ations to reciprocating strokes. v

Vhat I claim as my invention and de-v sire to secure by Letters Patent, is-

l. The employment of curved or inclined forks D1, D2, and El, E2, having a reciprocating rectilinear movement operating on or operated by cams a, b, c, in the manner and for the purposes herein set forth'.

2. The use of cams a, c constructed' or attached so that they may be turned or set in order to produce a change in direction of the motion, and acting in connection with forks D1, D2, and E1 E2 (or their equivalents) substantially, for the purposes expressed, as shown and described.

In testimony' whereof I have hereunto signed my name before two subscribing witnesses this 23 day of April 1851.

JOEL V. STRAIT.

Witnesses:

R. W. FENWICK, C. S'. S. GRIFFING. 

